DS26C31T/DS26C31M CMOS Quad TRI-STATE Differential Line Driver
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- Jocelin Greer
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1 DS26C31T/DS26C31M CMOS Quad TRI-STATE Differential Line Driver General Description The DS26C31 is a quad differential line driver designed for digital data transmission over balanced lines. The DS26C31T meets all the requirements of EIA standard RS-422 while retaining the low power characteristics of CMOS. The DS26C31M is compatible with EIA standard RS-422; however, one exception in test methodology is taken (Note 8). This enables the construction of serial and terminal interfaces while maintaining minimal power consumption. The DS26C31 accepts TTL or CMOS input levels and translates these to RS-422 output levels. This part uses special output circuitry that enables the drivers to power down without loading down the bus. This device has enable and disable circuitry common to all four drivers. The DS26C31 is pin compatible to the AM26LS31 and the DS26LS31. Connection Diagrams Dual-In-Line Package DS Top View Order Number DS26C31TM or DS26C31TN See NS Package Number M16A or N16E For Complete Military Product Specifications, refer to the appropriate SMD or MDS. Order Number DS26C31ME/883, DS26C31MJ/883 or DS26C31MW/883 See NS Package Number E20A, J16A or W16A All inputs are protected against damage due to electrostatic discharge by diodes to V CC and ground. Features n TTL input compatible n Typical propagation delays: 6 ns n Typical output skew: 0.5 ns n Outputs will not load line when V CC = 0V n DS26C31T meets the requirements of EIA standard RS-422 n Operation from single 5V supply n TRI-STATE outputs for connection to system buses n Low quiescent current n Available in surface mount n Mil-Std-883C compliant 20-Lead Ceramic Leadless Chip Carrier (E) Truth Table June 1998 DS ENABLE ENABLE Input Non-Inverting Inverting Output Output L H X Z Z All other L L H combinations of H H L enable inputs DS26C31T/DS26C31M CMOS Quad TRI-STATE Differential Line Driver L = Low logic state X = Irrelevant H = High logic state Z = TRI-STATE (high impedance) TRI-STATE is a registered trademark of National Semiconductor Corporation. FACT is a trademark of National Semiconductor Corporation National Semiconductor Corporation DS
2 Absolute Maximum Ratings (Notes 1, 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (V CC ) 0.5V to 7.0V DC Input Voltage (V IN ) 1.5V to V CC +1.5V DC Output Voltage (V OUT ) 0.5V to 7V Clamp Diode Current (I IK,I OK ) ±20 ma DC Output Current, per pin (I OUT ) ±150 ma DC V CC or GND Current, per pin (I CC ) ±150 ma Storage Temperature Range (T STG ) 65 C to +150 C DC Electrical Characteristics V CC = 5V ± 10% (unless otherwise specified) (Note 4) Max. Power Dissipation (P D C (Note 3) Ceramic J Pkg mw Plastic N Pkg mw SOIC M Pkg mw Ceramic W Pkg mw Ceramic E Pkg mw Lead Temperature (T L ) (Soldering, 4 sec.) 260 C This device does not meet 2000V ESD Rating. (Note 13) Operating Conditions Min Max Units Supply Voltage (V CC ) V DC Input or Output Voltage (V IN,V OUT ) 0 V CC V Operating Temperature Range (T A ) DS26C31T C DS26C31M C Input Rise or Fall Times (t r,t f ) 500 ns Symbol Parameter Conditions Min Typ Max Units V IH High Level Input Voltage 2.0 V V IL Low Level Input Voltage 0.8 V V OH High Level Output Voltage V IN = V IH or V IL, V I OUT = 20 ma V OL Low Level Output V IN = V IH or V IL, V Voltage I OUT = 20 ma V T Differential Output R L = 100Ω V Voltage (Note 5) V T V T Difference In R L = 100Ω 0.4 V Differential Output (Note 5) V OS Common Mode R L = 100Ω V Output Voltage (Note 5) V OS V OS Difference In R L = 100Ω 0.4 V Common Mode Output (Note 5) I IN Input Current V IN = V CC, GND, V IH,orV IL ±1.0 µa I CC Quiescent Supply DS26C31T V IN = V CC or GND µa Current (Note 6) I OUT = 0µA V IN = 2.4V or 0.5V ma (Note 6) DS26C31M V IN = V CC or GND µa I OUT = 0µA V IN = 2.4V or 0.5V ma (Note 6) I OZ TRI-STATE Output V OUT = V CC or GND Leakage Current ENABLE = V IL ±0.5 ±5.0 µa ENABLE = V IH I SC Output Short V IN = V CC or GND ma Circuit Current (Notes 5, 7) 2
3 DC Electrical Characteristics (Continued) V CC = 5V ± 10% (unless otherwise specified) (Note 4) Symbol Parameter Conditions Min Typ Max Units I OFF Output Leakage Current DS26C31T V OUT = 6V 100 µa Power Off (Note 5) V CC = 0V V OUT = 0.25V 100 µa DS26C31M V OUT = 6V 100 µa V CC = 0V V OUT = 0V 100 µa (Note 8) Note 1: Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device should be operated at these limits. The table of Electrical Characteristics provide conditions for actual device operation. Note 2: Unless otherwise specified, all voltages are referenced to ground. All currents into device pins are positive, all currents out of device pins are negative. Note 3: Ratings apply to ambient temperature at 25 C. Above this temperature derate N package at mw/ C, J package mw/ C, M package 9.80 mw/ C, E package mw/ C, and W package 6.75 mw/ C. Note 4: Unless otherwise specified, min/max limits apply across the recommended operating temperature range. All typicals are given for V CC = 5V and T A = 25 C. Note 5: See EIA Specification RS-422 for exact test conditions. Note 6: Measured per input. All other inputs at V CC or GND. Note 7: This is the current sourced when a high output is shorted to ground. Only one output at a time should be shorted. Note 8: The DS26C31M ( 55 C to +125 C) is tested with V OUT between +6V and 0V while RS-422A condition is +6V and 0.25V. Switching Characteristics V CC = 5V ±10%, t r 6 ns, t f 6ns(Figures 1, 2, 3, 4) (Note 4) Symbol Parameter Conditions Min Typ Max Units DS26C31T CS26C31M t PLH,t PHL Propagation Delays S1 Open ns Input to Output Skew (Note 9) S1 Open ns t TLH,t THL Differential Output Rise S1 Open ns And Fall Times t PZH Output Enable Time S1 Closed ns t PZL Output Enable Time S1 Closed ns t PHZ Output Disable Time S1 Closed ns (Note 10) t PLZ Output Disable Time S1 Closed ns (Note 10) C PD Power Dissipation 50 pf Capacitance (Note 11) C IN Input Capacitance 6 pf Note 9: Skew is defined as the difference in propagation delays between complementary outputs at the 50% point. Note 10: Output disable time is the delay from ENABLE or ENABLE being switched to the output transistors turning off. The actual disable times are less than indicated due to the delay added by the RC time constant of the load. Note 11: C PD determines the no load dynamic power consumption, P D = C PD V CC 2f+I CC V CC, and the no load dynamic current consumption, I S = C PD V CC f+ I CC. Comparison Table of Switching Characteristics into LS-Type Load V CC = 5V, T A = 25 C, t r 6 ns, t f 6ns(Figures 2, 4, 5, 6) (Note 12) Symbol Parameter Conditions DS26C31T DS26LS31C Units Typ Max Typ Max t PLH,t PHL Propagation Delays C L = 30 pf Input to Output S1 Closed ns S2 Closed Skew (Note 9) C L = 30 pf S1 Closed ns S2 Closed 3
4 Comparison Table of Switching Characteristics into LS-Type Load (Continued) V CC = 5V, T A = 25 C, t r 6 ns, t f 6ns(Figures 2, 4, 5, 6) (Note 12) Symbol Parameter Conditions DS26C31T DS26LS31C Units Typ Max Typ Max t THL,t TLH Differential Output Rise C L = 30 pf and Fall Times S1 Closed 4 6 ns S2 Closed t PLZ Output Disable Time C L = 10 pf (Note 10) S1 Closed ns S2 Open t PHZ Output Disable Time C L = 10 pf (Note 10) S1 Open ns S2 Closed t PZL Output Enable Time C L = 30 pf S1 Closed ns S2 Open t PZH Output Enable Time C L = 30 pf S1 Open ns S2 Closed Note 12: This table is provided for comparison purposes only. The values in this table for the DS26C31 reflect the performance of the device but are not tested or guaranteed. Note 13: ESD Rating: HBM (1.5 kω, 100 pf) Inputs 1500V Outputs 1000V EIAJ (0Ω, 200 pf) 350V Logic Diagram AC Test Circuit and Switching Time Waveforms DS Note: C1 = C2 = C3 = 40 pf (Including Probe and Jig Capacitance), R1 = R2 = 50Ω, R3=500Ω. FIGURE 1. AC Test Circuit DS
5 AC Test Circuit and Switching Time Waveforms (Continued) FIGURE 2. Propagation Delays DS FIGURE 3. Enable and Disable Times DS DS Input pulse; f = 1 MHz, 50%; t r 6 ns, t f 6ns FIGURE 4. Differential Rise and Fall Times 5
6 AC Test Circuit and Switching Time Waveforms (Continued) DS FIGURE 5. Load AC Test Circuit for LS-Type Load FIGURE 6. Enable and Disable Times for LS-Type Load DS Typical Applications Two-Wire Balanced System, RS-422 *R T is optional although highly recommended to reduce reflection. DS
7 Typical Performance Characteristics Differential Propagation Delay vs Temperature Differential Propagation Delay vs Power Supply Voltage Differential Skew vs Temperature DS DS DS Differential Skew vs Power Supply Voltage Differential Transition Time vs Temperature Differential Transition Time vs Power Supply Voltage DS DS DS Complementary Skew vs Temperature Complementary Skew vs Power Supply Voltage Differential Output Voltage vs Output Current DS DS DS
8 Typical Performance Characteristics (Continued) Differential Output Voltage vs Output Current Output High Voltage vs Output High Current Output High Voltage vs Output High Current DS DS DS Output Low Voltage vs Output Low Current Output Low Voltage vs Output Low Current Supply Current vs Temperature DS DS DS Supply Current vs Power Supply Voltage No Load Supply Current vs Data Rate Loaded Supply Current vs Data Rate DS DS DS
9 Typical Performance Characteristics (Continued) Output Short Circuit Current vs Temperature Output Short Circuit Current vs Power Supply Voltage DS DS
10 Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Ceramic Leadless Chip Carrier (E) Order Number DS26C31ME/883 NS Package Number E20A 16-Lead Ceramic Dual-In-Line Package (J) Order Number DS26C31MJ/883 NS Package Number J16A 10
11 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Molded Package Small Outline (M) Order Number DS26C31TM NS Package Number M16A 16-Lead Molded Dual-In-Line Package (N) Order Number DS26C31TN NS Package Number N16E 11
12 DS26C31T/DS26C31M CMOS Quad TRI-STATE Differential Line Driver Physical Dimensions inches (millimeters) unless otherwise noted (Continued) LIFE SUPPORT POLICY NATIONAL S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE- VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMI- CONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 16-Lead Ceramic Flatpak Package (W) Order Number DS26C31MW/883 NS Package Number W16A 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Corporation Americas Tel: Fax: support@nsc.com National Semiconductor Europe Fax: +49 (0) europe.support@nsc.com Deutsch Tel: +49 (0) English Tel: +49 (0) Français Tel: +49 (0) Italiano Tel: +49 (0) National Semiconductor Asia Pacific Customer Response Group Tel: Fax: sea.support@nsc.com National Semiconductor Japan Ltd. Tel: Fax: National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
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